crack the whip

例句：

1. 1. The teacher cracked the whip on the students for not paying attention in class.
   老师对学生们不专心听讲的行为进行了严厉的批评。
2. 2.The boss cracked the whip on his employees for missing deadlines.
   老板对员工们因未能按时完成任务而施加了严厉的管束。
3. 3. During the exam, the teacher cracked the whip to ensure that all students paid attention and completed their work on time.
   考试期间，老师严厉地批评了所有学生，以确保他们全神贯注并按时完成作业。